The shop manual wouldn't do any good. It is in the programming of the Nav software/firmware and/or backup camera software/firmware. I suspect the ones that show the gridlines and the full RDS display have a different level software/firmware.There must be a way of having the guidelines and I highly suspect every car has the software to display the lines.
Can we get the shop manual? The dealer service manual may show this as an option.
In the USA the lack of is probably due to some lawyer saying there could be some potential legal liability issue of indicating distance and it not being exact.